package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {


    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

//    统计指定时间区间内的营业额数据
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
//        当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算、计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

//        存每天的营业额
        List<Double> turnList=new ArrayList<>();

        for (LocalDate date : dateList) {
//            查询date日期对应的营业证数据。也就是状态为：已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);  //获取date这一天中最小的时刻 00：00
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);  //获取date这一天中最大的时刻 23：59：599999

//            select sum(amount) from orders where order_time> ？order_time <? and status= 5
            Map map=new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnOver=orderMapper.sumByMap(map);
            turnOver=turnOver == null ? 0.0 :turnOver;
            turnList.add(turnOver);
        }

////        把dateList里的元素取出来并用“，”分割 变成String类型
//        String date = StringUtils.join(dateList, ",");
////        把turnList里的元素取出来并用“，”分割 变成String类型
//        String turn = StringUtils.join(turnList, ",");

        return TurnoverReportVO
                .builder().
                dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnList, ","))
                .build();
    }

//    统计指定时间区间内的用户数据
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
//        当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算、计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id)) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
//        存放每天的总用户数量   select count(id)) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map=new HashMap<>();
            map.put("end",endTime);
//            总用户数据
            Integer totalUser=userMapper.countByMap(map);
//            新增用户数量
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
//        封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

//    统计指定时间区间内的订单数据
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
//        当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算、计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

//        存放每天的订单总数
        List<Integer> orderCountList=new ArrayList<>();
//        存放每天的有效订单总数
        List<Integer> validOrderCountList=new ArrayList<>();

//        遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
//            查询每天订单总数 select count(id) from orders where create_time > ? and create_time<?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
//            查询每天的有效订单数  select count(id) from orders where create_time > ? and create_time<? and status=5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();//把orderCountList里的元素合并求和
        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

//        订单完成率
        Double orderCompletionRate =0.0;
        if (totalOrderCount !=0){
            orderCompletionRate =validOrderCount.doubleValue()/totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

//    统计指定时间区间内的销量前十
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names=salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

//    导出运营数据报表
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1、获取营业数据---近三十天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

//        查询概览数据
        BusinessDataVO dataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2、通过POI将数据写入到Excel文件中

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
//        基于模板文件创建一个新的excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
//            填充数据 ---时间
            XSSFSheet sheet = excel.getSheet("Sheet1");//获取表格文件的标签页

            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

//            获得第四行
            XSSFRow row = sheet.getRow(3);  // 获取第四行
            row.getCell(2).setCellValue(dataVO.getTurnover());
            row.getCell(4).setCellValue(dataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(dataVO.getNewUsers());

//            获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(dataVO.getValidOrderCount());
            row.getCell(4).setCellValue(dataVO.getUnitPrice());

//            填充明细数据
            for (int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

//                获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }


            //3、通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

//            关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

    //    根据条件统计订単数量
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map =new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }
}
